Remove Regex.init<R: RegexComponent>(_: R).

`Regex.init<R: RegexComponent>(_: R)` has existed as a way to convert any `RegexComponent` to a `Regex`. However, it is not super useful for the end user. More importantly, its existence seems to cause bad error messages in regex builder closures.

When this initializer is deleted, error messages become better and more localized. The user can still obtain a `Regex` from any `RegexComponent` just by calling the `regex` property.

Author: rxwei

Sources/RegexBuilder/DSL.swift

@@ -16,7 +16,7 @@ extension Regex {
   public init<Content: RegexComponent>(
     @RegexComponentBuilder _ content: () -> Content
   ) where Content.Output == Output {
-    self.init(content())
+    self = content().regex
   }
 }
 

Sources/_StringProcessing/Regex/Core.swift

@@ -81,12 +81,6 @@ public struct Regex<Output>: RegexComponent {
     self.init(ast: try! parseWithDelimiters(pattern))
   }
 
-  public init<Content: RegexComponent>(
-    _ content: Content
-  ) where Content.Output == Output {
-    self = content.regex
-  }
-
   public var regex: Regex<Output> {
     self
   }

Tests/RegexBuilderTests/RegexDSLTests.swift

@@ -22,7 +22,7 @@ class RegexDSLTests: XCTestCase {
     line: UInt = #line,
     @RegexComponentBuilder _ content: () -> Content
   ) throws {
-    let regex = Regex(content())
+    let regex = content()
     for (input, maybeExpectedCaptures) in tests {
       let maybeMatch = input.match(regex)
       if let expectedCaptures = maybeExpectedCaptures {